I've posted a variety of related questions here and on other sites, so this may seem vaguely familiar, but I've arrived at the following:
Background - I've had a '65 U.S. Vox Berkeley V8 tube amp for decades. I got it with a Buckingham cabinet which I like and still use (2x oxford alnico 12s.) As part of a restoration project, I finally got a beautiful Berkeley cabinet and trolley, but it came from a solid state version which used different speakers. The "new" cabinet has a pair of 8 ohm Celestion 7424s, instead of the 16ohm 7442s the V8 would have come with. I will keep looking for Vox/Celestion 7442s, but it will probably be a long & difficult search, since the 7442's have achieved mythic status.
Question 1 - Since my 7424s are from same era as the holy grail 7442s and have N1B4 cone stamps, are they identical except for the impedance? (Would they sound equally grailish?)
Question 2 - I have a half dozen 70V multi-tap transformers lying around that were pulled from very hi-fi N.E.A.R. outdoor speakers.
The primary wires are: Com, 128w, 64w, 32w, 8w, 4w. Secondary: Com, 8ohm, 4ohm.
My minimal web research (a dangerous thing) makes me think the secondary of these is simply an autoformer. Can I use the secondary (only) as an impedance matcher? In other words, if I were to completely ignore the primary taps, could I safely try out my 4ohm cab with my 8ohm amp by running the amp into the 8ohm tap of the secondary, with speakers fed by the 4 ohm tap?
Thanks very much. Please forgive if I post the same question elsewhere.